Option variable
negdistribDefault value: true
When negdistrib is true, -1 distributes
over an expression. E.g., -(x + y) becomes - y - x. Setting it to false
will allow - (x + y) to be displayed like that. This is sometimes useful
but be very careful: like the simp flag, this is one flag you do not
want to set to false as a matter of course or necessarily for other
than local use in your Maxima.